gulpfile.js

'use strict';

var gulp = require('gulp'),
    del = require('del');
// Load plugins
var $ = require('gulp-load-plugins')(),
    browserify = require('browserify'),
    watchify = require('watchify'),
    source = require('vinyl-source-stream'),
    sourceFile = './app/scripts/app.js',
    destFolder = './dist/scripts',
    destFileName = 'app.js';

// Styles
gulp.task('styles', function () {
    return gulp.src('app/styles/main.scss')
        .pipe($.rubySass({
            style: 'expanded',
            precision: 10,
            loadPath: ['app/bower_components']
        }))
        .pipe($.autoprefixer('last 1 version'))
        .pipe(gulp.dest('dist/styles'))
        .pipe($.size());
});

// Scripts
gulp.task('scripts', function () {
    var bundler = watchify(browserify({
        entries: [sourceFile],
        insertGlobals: true,
        cache: {},
        packageCache: {},
        fullPaths: true
    }));

    bundler.on('update', rebundle);

    function rebundle() {
        return bundler.bundle()
            // log errors if they happen
            .on('error', $.util.log.bind($.util, 'Browserify Error'))
            .pipe(source(destFileName))
            .pipe(gulp.dest(destFolder));
    }

    return rebundle();
});

// HTML
gulp.task('html', function () {
    return gulp.src('app/*.html')
        .pipe($.useref())
        .pipe(gulp.dest('dist'))
        .pipe($.size());
});

// Images
gulp.task('images', function () {
    return gulp.src('app/images/**/*')
        .pipe($.cache($.imagemin({
            optimizationLevel: 3,
            progressive: true,
            interlaced: true
        })))
        .pipe(gulp.dest('dist/images'))
        .pipe($.size());
});

// Clean
gulp.task('clean', function (cb) {
    cb(del.sync(['dist/styles', 'dist/scripts', 'dist/images']));
});

// Bundle
gulp.task('bundle', ['styles', 'scripts', 'bower'], function () {
    return gulp.src('./app/*.html')
        .pipe($.useref.assets().on('error', $.util.log))
        .pipe($.useref.restore())
        .pipe($.useref())
        .pipe(gulp.dest('dist'));
});

// Webserver
gulp.task('serve', function () {
    gulp.src('./dist')
        .pipe($.webserver({
            livereload: true,
            port: 9000
        }));
});

// Bower helper
gulp.task('bower', function () {
    gulp.src('app/bower_components/**/*.js', {base: 'app/bower_components'})
        .pipe(gulp.dest('dist/bower_components/'));

});

gulp.task('json', function () {
    gulp.src('app/scripts/json/**/*.json', {base: 'app/scripts'})
        .pipe(gulp.dest('dist/scripts/'));
});

// Robots.txt and favicon.ico
gulp.task('extras', function () {
    return gulp.src(['app/*.txt', 'app/*.ico'])
        .pipe(gulp.dest('dist/'))
        .pipe($.size());
});

// Watch
gulp.task('watch', ['html', 'bundle', 'serve'], function () {
    // Watch .json files
    gulp.watch('app/scripts/**/*.json', ['json']);

    // Watch .html files
    gulp.watch('app/*.html', ['html']);

    // Watch .scss files
    gulp.watch('app/styles/**/*.scss', ['styles']);

    // Watch image files
    gulp.watch('app/images/**/*', ['images']);
});

// Build
gulp.task('build', ['html', 'bundle', 'images', 'extras']);

// Default task
gulp.task('default', ['clean', 'build']);